The key is to take the time to find the clothes that fit you properly.
Wearing a shirt over a cool t-shirt will create horizontal line that will slim your torso and camouflage your belly. Avoid busy prints and vertical strips that will only make you look bigger.
Wear straight cut pants instead of baggy ones. Avoid tight belts and do not tuck your shirt in your pants!
You can go crazy in the shoes department just make sure the shoes look proportional to your body (not to narrow and not too wide).